scispace - formally typeset
Search or ask a question
Topic

Nuclear matter

About: Nuclear matter is a research topic. Over the lifetime, 10180 publications have been published within this topic receiving 248261 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the relativistic mean field theory was used to construct the EOS in a wide density range for neutron stars using the relatival mean field theories and applied it to investigate the neutron star properties such as maximum mass and composition of neutron stars.
Abstract: We construct the equation of state (EOS) in a wide density range for neutron stars using the relativistic mean field theory. The properties of neutron star matter with both uniform and nonuniform distributions are studied consistently. The inclusion of hyperons considerably softens the EOS at high densities. The Thomas-Fermi approximation is used to describe the nonuniform matter, which is composed of a lattice of heavy nuclei. The phase transition from uniform matter to nonuniform matter occurs around $0.06 {\mathrm{fm}}^{\ensuremath{-}3},$ and the free neutrons drip out of nuclei at about $2.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4} {\mathrm{fm}}^{\ensuremath{-}3}.$ We apply the resulting EOS to investigate the neutron star properties such as maximum mass and composition of neutron stars.

78 citations

Journal ArticleDOI
TL;DR: In this article, the 1 S 0 and 3 S 1 spinchannels calculated with Lattice QCD (LQCD) were used to quantify the energy shift of the hyperon in dense neutron matter, as might occur in the interior of a neutron star.
Abstract: eld theory. The interactions determined from QCD are consistent with those extracted from hyperon-nucleon experimental data within uncertainties, and strengthen theoretical arguments that the strange quark is a crucial component of dense nuclear matter. The interactions between hyperons and nucleons are important for understanding the composition of dense nuclear matter. In high-density baryonic systems, the large values of the Fermi energies may make it energetically advantageous for some of the nucleons to transform into hyperons via the weak interactions, with the increase in rest mass being more than compensated for by the decrease in combined Fermi energy of the baryon-lepton system. This is speculated to occur in the interior of neutron stars, but a quantitative understanding of this phenomenon depends on knowledge of the hyperon-nucleon (YN) interactions in the medium. In this letter we use n scattering phase shifts in the 1 S0 and 3 S1 spinchannels calculated with Lattice QCD (LQCD) to quantify the energy shift of the hyperon in dense neutron matter, as might occur in the interior of a neutron star. Our results strongly suggest an important role for strangeness in such environments. Precise nucleon-nucleon (NN) interactions constrained by experiment and chiral symmetry, together with numerically small but important three-nucleon interactions, have served as input to rened many-body techniques for

78 citations

Journal ArticleDOI
TL;DR: It is conjectured here that the characterization of the plasma as a free or weakly interacting gas of quarks and gluons is valid only for short distances and short time scales of the order 1/T, but that at scales larger than 1/g/sup 2/T the plasma exhibits confining features similar to that of the low-temperature hadronic phase.
Abstract: It is a widely held belief that at temperatures much higher than the confinement scale of quantum chromodynamics (QCD), quarks and gluons become free, giving rise to a new form of matter, called the quark-gluon plasma. It is conjectured here that the characterization of the plasma as a free or weakly interacting gas of quarks and gluons is valid only for short distances and short time scales of the order 1/T, but that at scales larger than 1/${g}^{2}$T (where ${g}^{2}$ is the running QCD coupling) the plasma exhibits confining features similar to that of the low-temperature hadronic phase. The confining features are manifest in the long-range, i.e., long-wavelength, low-frequency, modes of the plasma. To examine the long-range real-time response of the plasma goes beyond the capabilities of current lattice-gauge-theory techniques. However, some properties of these modes can be determined indirectly. An attempt is made to characterize the long-range modes of excitation by examining the static high-temperature limit, focusing upon the static screening lengths of colored and neutral local operators. Since ${g}^{2}$ is not small at temperatures likely to be accessible in heavy-ion collisions, the nonperturbative effects associated with vestiges of confinement are likely to be important in the phenomenological analysis of measurements made at accelerators.

78 citations

Journal ArticleDOI
TL;DR: A fully self-consistent treatment of short-range correlations in nuclear matter shows different implementations of the determination of the nucleon spectral functions for different interactions to be consistent with each other, suggesting a possible resolution of the nuclear matter saturation problem.
Abstract: A fully self-consistent treatment of short-range correlations in nuclear matter is presented. Different implementations of the determination of the nucleon spectral functions for different interactions are shown to be consistent with each other. The resulting saturation densities are closer to the empirical result when compared with (continuous choice) Brueckner-Hartree-Fock values. Arguments for the dominance of short-range correlations in determining the nuclear matter saturation density are presented. A further survey of the role of long-range correlations suggests that the inclusion of pionic contributions to ring diagrams in nuclear matter leads to higher saturation densities than empirically observed. A possible resolution of the nuclear matter saturation problem is suggested.

77 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the properties of the antikaons in nuclear matter from a chiral unitary approach which incorporates the $s$- and $p$-waves of the k-N$ interaction.
Abstract: The properties of the antikaons in nuclear matter are investigated from a chiral unitary approach which incorporates the $s$- and $p$-waves of the $\overline{K}N$ interaction. To obtain the in-medium meson-baryon amplitudes we include, in a self-consistent way, Pauli blocking effects, meson self-energies corrected by nuclear short-range correlations and baryon binding potentials. We pay special attention to investigating the validity of the on-shell factorization, showing that it cannot be applied in the evaluation of the in-medium corrections to the $p$-wave amplitudes. In nuclear matter at saturation energy, the \ensuremath{\Lambda} and \ensuremath{\Sigma} develop an attractive potential of about \ensuremath{-}30 MeV, while the ${\ensuremath{\Sigma}}^{*}$ pole remains at the free space value although its width gets sensibly increased to about 80 MeV. The antikaon also develops a moderate attraction that does not support the existence of very deep and narrow bound states, confirming the findings of previous self-consistent calculations.

77 citations


Network Information
Related Topics (5)
Quark
43.3K papers, 951K citations
93% related
Quantum chromodynamics
47.1K papers, 1.2M citations
92% related
Neutrino
45.9K papers, 1M citations
91% related
Supersymmetry
29.7K papers, 1.1M citations
89% related
Gauge theory
38.7K papers, 1.2M citations
88% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023132
2022299
2021252
2020268
2019256
2018240